Finding the Fourth Proportional to 2,631.87, 3,948.34 and 782.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,631.87 : 3,948.34 = 782.82 : x
2. Step 2: Convert to fraction form
   2,631.87/3,948.34 = 782.82/x
3. Step 3: Cross multiply
   2,631.87x = 3,948.34 × 782.82
4. Step 4: Simplify right side
   2,631.87x = 3,090,837.56
5. Step 5: Solve for x
   x = 3,090,837.56/2,631.87
6. Step 6: Final answer
   x = 1,174.39